Q: Which of the following is the correct formula for calculating molarity ($$M$$)?

$$M = \frac{\text{moles of solute}}{\text{liters of solution}}$$

Question 1

Which of the following best describes an aqueous solution?

Accepted Answer

A solution in which water is the solvent

Question 2

Which statement correctly identifies the two parts of a solution and their roles?

Accepted Answer

The solute is the substance being dissolved, and the solvent is the substance doing the dissolving

Question 3

Which of the following best defines an electrolyte?

Accepted Answer

A substance that produces ions when dissolved in water and conducts electricity

Question 4

What does it mean for a compound to dissociate in water?

Accepted Answer

It separates into its constituent ions

Question 5

Why is water a good solvent for ionic compounds even though it is neutral?

Accepted Answer

Because water is highly polar and can stabilize ions through solvation

Question 6

Which of the following best describes solvation?

Accepted Answer

The process by which solvent molecules surround and interact with solute ions or molecules

Question 7

A student mixes solutions of silver nitrate and sodium chloride, resulting in the formation of a white solid. What type of reaction has occurred?

Accepted Answer

A precipitation reaction

Question 8

Which of the following is a correct net ionic equation for the reaction between aqueous solutions of lead(II) nitrate and sodium chloride?

Accepted Answer

$$\mathrm{Pb$$^{2+}$$ (aq) + 2Cl^- (aq) \rightarrow $$PbCl_2$$ (s)}$$

Question 9

Which of the following best describes a strong electrolyte?

Accepted Answer

A substance that completely dissociates into ions in solution

Question 10

Which of the following is the correct oxidation number of oxygen in $$\mathrm{H_2O_2} ($$hydrogen peroxide)?

Accepted Answer

$$-1$$

Question 11

A solution is prepared by dissolving $$3.68\ \mathrm{g} of$$ $$C_6H_{12}O_6$ (glucose, molar mass 180$$\ \mathrm{g/mol}$$) in enough water to make 0.275$$\ \mathrm{L}$$ of solution. What is the molarity of the solution?

Accepted Answer

$$0.074\ \mathrm{M}$$

Question 12

Which of the following best describes a neutralization reaction?

Accepted Answer

A reaction in which an acid and a base react to form water and a salt

Question 13

Which of the following is the correct formula for calculating molarity ($$M$$)?

Accepted Answer

$$M = \frac{	ext{moles of solute}}{	ext{liters of solution}}$$

Question 14

Which of the following is a correct example of an oxidation-reduction (redox) reaction?

Accepted Answer

$$\mathrm{2Na (s) + Cl_2$ (g) \rightarrow 2NaCl (s)}$$

Question 15

A student needs to prepare $$0.675\ \mathrm{L} of$$ $$1.0\ \mathrm{M}$$ acetic acid solution from a $$6.0\ \mathrm{M}$$ stock solution. What volume of the stock solution is required? (Use $$M_1V_1 = M_2V_2)$$

Accepted Answer

$$0.113\ \mathrm{L}$$

Question 16

Which of the following best describes a base according to the Arrhenius definition?

Accepted Answer

A substance that produces $$\mathrm{OH^-}$$ ions in aqueous solution

Question 17

Which of the following is the correct oxidation number of oxygen in $$\mathrm{KCH_3COO} ($$potassium acetate)?

Accepted Answer

$$-2$$

Question 18

Which of the following statements about strong and weak electrolytes is correct?

Accepted Answer

Strong electrolytes completely dissociate into ions in solution, while weak electrolytes only partially dissociate

Question 19

A $$48.0\ \mathrm{mL}$$ sample of NaOH solution neutralizes $$35.0\ \mathrm{mL} of$$ $$0.144\ \mathrm{M}$$ $$\mathrm{H_2SO_4}. $$What is the molarity of the NaOH solution? (Assume the reaction is $$2\mathrm{NaOH} + \mathrm{H_2SO_4} \rightarrow 2\mathrm{H_2O} + \mathrm{Na_2SO_4})$$

Accepted Answer

$$0.210\ \mathrm{M}$$

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